Ollie Super has moved in and out of cancer treatment since she was diagnosed with neuroblastoma as a toddler in foster care. Now 8, the second grader is dealing with it again. Her cancer came back late last year. Ollie’s parents, who adopted her in 2020, tried to sign her up for a clinical trial using CAR T-cell therapy — which genetically reprograms a patient’s white blood cells to help them fight cancer — at UNC Health in Chapel Hill, an hour-…